ABB IRB 6400R Product On-Line Manual page 339

Module- and network status LEDs at power-up
The system performs a test of the MS and NS LEDs during start-up. The purpose of this test
is to check that all LEDs are functioning properly. The test runs as follows:
- - NS LED is switched Off.
- - MS LED is switched On green for approx. 0.25 seconds.
- - MS LED is switched On red for approx. 0.25 seconds.
- - MS LED is switched On green.
- - NS LED is switched On green for approx. 0.25 seconds.
- - NS LED is switched On red for approx. 0.25 seconds.
- - NS LED is switched On red.
If a device has other LEDs, each LED is tested in sequence.
CAN Tx - CAN network transmit
Description
Green LED. Physically connected to the
Can Tx line. Flashes when the CPU is
receiving data on the CAN bus.
CAN Rx - CAN network receive
Description
Green LED. Physically connected to the
Can Rx line. Flashes when the CPU is
transmitting data on the Can bus.
Product Manual
Troubleshooting Tools
Remedy / Source of fault
If no light when transmission is expected,
check error messages.
Check system boards in rack.
Remedy / Source of fault
If no light, check network and
connections.
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